Arrangement for the printing of forms covered with elastic foil



April 27, 1954 2,676,541

A. BTTNER ARRANGEMENT FOR THE PRINTING OF FORMS COVERED WITH ELASTICFOIL Filed"Jan. 2, 1952 L ATTORNEY Patented Apr. 27, 1954 ABBANGEMENTyFOR THE ,'.PEII'NTING .0F FoRMs COVERED W133i; nl iesrieren.

Artur Bttner, Heidelberg Germani', assigner @to .rsehneupresseniehrikAlsiieneeesllesiliefi ei'- Germany nemers, Heidelberg; Germain/Q,afeeriwreiien if Applicat'ipn-Jnuarfy 2, 1952, fSelivalNo. 64,405

@laines priority, applieatinn ,.Germaiiy .Merch 2, 1.9.5.1

:9 lalims. jl

.In the relief printing; of printing forms, 'fthe .millliaQture o fwhich 'inthe usual construction is Very expensive, it is knojwn :tocover a printing form, made of any suitable material, by a tiiin elasticskin and to draw this skin, `which may ,c onsist offfpr instance, arubber foil, iirm'ly onto the form ley proyijding a negative pressure,so that all contours and surfaces of -the form stand Qut lealy-The'iinpression on thefpaperv'isthen teffected by the inked rubber skin.The sections which, after vthe applicationof the lrubber skin,constitute `the printing g-forrn proper, are laid on a smooth bed plate,vl/hich is fitted 'directly onto .the type 'bed .of a 'high-speedcylinder press, or iinto Vaplaten p1je ss}, so that the fform, luponWithdrawailrof the gaiif, only has AA-to 'be sealed off Yin an upwarddirection. iHoweyer, sit is lnot possible with 'these bed plates Mtorprint, in `a single loperation ,form s vwhich also contain, in additionto the Isections to `bejtirinted, type consisting of metal or woodencharacters, or oflolock` sections, ywhichare .of n qrmahheight.

An o b'ject Qfjtlie present invention'is to provide .an raIrangernentvlqyrneans jof which it -is possible, simultaneously :to -set Iup*normal metal o r YWood type, or 'typehigh-vprinting'- blocks, withsections kof any suitablamaterialplaced onasbedjplate of suitablejheight, and to vcarry out the printing ithereof'in one operation. A'.flcc'ordi-ng"toi-the"invenftionfthe arrangement uforereliefpifintging bymeans of 4an'ela'stic skin which -covers the Ppri'ntngfform Yand whichis maintained on the latter ibygnegative pressure, consists -of -a chaseyfor the io`rm, which Yis closed in afm-tight fashion against thejtypebed,and carries'the foilin airtight'fgashion.*Thechase'isipreferablyprovided onrits-upperjiace Vwith a surroundinggroove which `cqrnrnunicates Withthe space enclosedby said. chasel and`which `is covered loy an Aelastic skin, lsaid chase ibeing providedvonA its Aundersidewith afyieldable packing strip. Thisjpackingstripcanbe clarnpediin "a recess jformed in the underside ofjthe chase,thespaee enclosed bythe recess A andithe chase being Aadapted to be'connected to a source of (pressure vmedium vin orderthat thepacking mayeitheribe jpressed ionto the support lgyjproviding a'negativejpressure.or withdrawn into thehase recess' ley-means vof suetion y"air,y"cheflatter opera.- tionbeingfor thejpurpose'f more readily rernovingtnechase. "Due'to the arrangement Yci' tire palririe strip, l-fill.inequalities in ih@ Slieiiorbgare equaiized, yso that by y'theapplicaticnpftnewpakine.. strip .by (meeneem. @repressed .ein e stehlenAQf.-fc.Oiripressed eirrisgplaerliareiindilie.lleseibefarebbeair,:l.oe.eied"fbeiweei1iheelesilcslsirreesl ftheiehesetis drewncff.

.The groeve .fermel the ripper frire 0f ille .these .ililis 'retains.elastic 4elriri irl pQSiiiQn :iiriiler 'the actien ,ef161,1?,riestative pressiireor vele'- uum upon the withdrawal ofair'irorn the inter .sneer Qf .the ...Chase seid skin .herrie held .taut.Qver `the form 'in SliQil manner that the contours qfthiforrn standoutin relief fashion. By Vmeans of this arrangement; it is P.QSSible forthe rst .time toprint in one operation fa mixed type bed .ef .eliereierefof .-nerriiel height, type-high prim'- irie jplceks andiettersprpieturelelons. .plaeed on .a .slippers of ,suitable .height .thissooerein :alsolbeineppssible on platen presses.

For a better .understanding dfthe invention Lft 1 5 .andtn shoyvA hoxgvitinianlie carriedintoeiect, `rl.the

l saine zwillnow alge more' fullyidesribed. with refere etotneoiistr 1the aegorripanyine draw j:herein Figure i is a plan vieu of a corner ofa printing 20 chase; 'n

rF.ig11re2:is-si QrpsSfseetien-ethereof; EFigure `3 rissa ,ergss-'section. showing Ya modied @rrengemenvt'and .e ,Figure 4 ,is a sectionon the line IV-IV lof 25 Figllrefl- Y 'l :The .Cliese ceri-siste lef@entrai .bar ll `which @is smilesedietle tir s S pysupperiiiie liarsfwliiehipreieei bevo fiheeeni'relbar line .bars ,landfbeiiie n *y y 4.:fhesupportingpars iiielriiiirierirles with greci/es .d llroimetely .et.the -.1ev.e1 flhetelitralibard end which cerner I.ernstes farmed in zBirrerie-ed iinfiheseerpoves fiheedeefheds ll @of wrecking strip 8.' xA.bQre lfasls :from-ith@ ilQWer face .of theceniral @bar TI `to a theeeled -liole -iritoiwliieh iS `Screwed la ripple .il arranged .iOprei/idea enneetionto 40 the pressure pipe of a pump.`

zCire `reenter ber l is iorrned .in its upper Aface efwiih A e .ergere11:2] .fend duets A.or bores 1.3 .extend bed reformed abolsesik. l.minii'nieete fwiihge-Colleeine duet H, soferlsiihe .leiierfeceerdirie i0rieure f2 .ieeprvided .Wliheip l llliimwhqh thereis .Onnected.lal .heee'I9 inepto ihesileiien bilieefe .reeiiiim clamped in the chase I-3 by alocking arrange-- ment a-b-c and strip d. This form, for example, mayconsist of normal metal or wood type letters e and support 2l forembossed printing characters 22, all of which are placed with the chaseon the type bed I4, and then covered by v a foil 23 which also coversthe'groove I2. By applying a slight positive pressure through III-I I tothe space 24 located between the center bar I and the packing strip 8,the packing strip is forced against the type bed I4 and thereby sealsoff the chase against the type bed to make it air tight. The spaceenclosed by the type bed- Id the chase I--3 and the foil 23, thussealed, is then subjected to negative pressure or vacuum by connectionI8, or connection 20, so that the foil 23, held by the edges of thegrooves I2, conf pletely from the type bed I4, or other support. Thefoil 23, for instance, a rubber cloth, can then v be removed, and thechase I-3 can also be lifted in known manner from the type bed I4.

For the purpose of withdrawing air from the space enclosed by ther chaseI-3, it is possible to employ the same suction pump as is provided onthese printing presses for the sheet delivery means, i

I claim:

1. In a printing press for use with an elastic foil, a type bed, a chaseon the type bed, a printing character support surrounded by said chasein spaced relation to the inner side of the chase, said chase comprisinga central frame bar having an upwardly opening groove on its upper faceand a bore for connecting said groove with the space between the innerside of the chase and the printing character support, supporting sidebars projecting below said frame -bar to provide a space between thechase vand the type bed, -a exible packing member in said space, a pres--sure connection on the chase communicating with the inner side of thepacking member to expand the same into contact with the type bed.

' ing character support surrounded by said chase in spaced relationtovthe inner side of the chase,

the support said chase comprising a central frame bar hav-y ing anupwardly opening groove on its upper face and a bore for connecting saidgroove with the Aspace between the inner side of the chase and theprinting character support, supporting side bars projecting below saidframe bar to provide a space between the chase and the type bed, a

-flexible packing member in said space, a pressure connection on thechase communicating with the inner side of the packing member to expandthe same into contact with the type bed,

and passageways communicating with the area within the chase and aboutthe type character support to cause a foil to be drawn by vacuumpressure over the printing characters on the support within the chase.

3. In a printing press for the printing of a form releasably coveredwith an elastic foil, a type bed mounted in said press, a printing formmounted on said type bed', printing characters mounted on said form, achase mounted on said type bed and around said printing form having theprinting characters mounted thereon, means for locking said printingform in said chase, said means being positioned between the form and thechase, an elastic foil covering both said printing form having theprinting characters thereon and said chase, positive pressure means forsealing the chase against the type bed, said means being operativelyconnected to said chase, and negative pressure means for the air-tightsealing of said elastic foil against said chase and said printing form,said means being operatively connected to said type bed and said chase.

4. In a printing press for the printing of a form 7 releasably coveredwith an elastic foil, a type bed mounted in said press, a printing formmounted on said type bed, printing characters mounted on said form, achase mounted on said type bed and laterally spaced around said printingform. said chase having on its upper side a surrounding groove, saidchase and said printing form having a space therebetween,v means forlocking said printing form in said chase, said means being positioned insaid space between said printing form and said chase, an elastic foilcovering both said printing form having the printing characters thereonand said chase including said surrounding groove, positive pressuremeans for sealing the chase against the type bed, said means beingoperatively connected to said chase and including a packing strip on theunderside of said chase and adjacent said type bed, and negativepressure means for the air-tight sealing of said elastic foil againstsaid chase and said printing form, said means including means foroperatively connect- .said chase with the said space between the chaseand printing form, said negative pressure means being operativelyconnected to said type bed and said chase.

5. In a printing press for the printing of a form releasably coveredwith an elastic foil, a type bed mounted in said press, a printing formmounted on said type bed, printing characters mounted on said form, achase mounted on said type bed and around said printing form, said chasehaving a recess on its underside opposite said type bed, a packing stripclamped in said recess forming a. space between it and said chase, meansfor locking said printing form in said chase, said means beingpositioned between the form and the chase, an elastic foil covering bothsaid printing form having the printing characters thereon and saidchase, positive pressure means for sealing the chase against the typebed, said means being operatively connected to said chase at the spacebetween it and said packing strip, and negative pressure means for theair-tight sealing of said elastic foil against said chase and saidprinting form, said means being operatively connected to said type bedand said chase.

6. In a printing press for the printing of a form releasably coveredwith an elastic foil, a type bed mounted in said press, a printing formmounted and means in the type bed comprising a nipple 75 on said typebed, printingv characters mounted on said form, a chase mounted on saidtype bed and around said printing form having the printing charactersmounted thereon. said chase including a frame bar and supporting bars ateach side of said frame bar, said supporting bars projecting |be1ow theframe bar thus forming a recess, a packing strip clamped between thesaid supporting bars at a distance from said chase and adjacent said.,type bed, means for locking said printing form in said chase, said meansbeing positioned between the form and the chase, an elastic foilcovering both said printing form having the printing characters thereonand said chase, positive pressure means for sealing the chase againstthe type bed, said means being operatively connected to said chase, andnegative pressure means for the air-tight sealing of said elastic foilagainst said chase and said printing form, said means being operativelyconnected to said type lbed and said chase.

7. In a printing press for the printing of a form releasably coveredwith an elastic foil, a type bed mounted in said press, a printing formmounted on said type bed, printing characters mounted on said form, achase mounted on said type bed and around said printing form, said chaseand said printing form having a space therebetween, means for lockingsaid printing form in said chase, said means being positioned in saidspace between said printing form and said chase, an elastic foilcovering both said printing form having the printing characters thereonand said chase, positive pressure means for sealing the chase againstthe type bed, said means :being operatively connected to said chase, andnegative pressure means for the air-tight sealing of said elastic foilagainst said chase and said printing form, said means includinga'suction means connected to the said space between the chase and theprinting form, said space being operatively connected to said chase atthe surface covered by said elastic foil and to the type bed at itssurface adjacent. to the chase. f"

8. In a printing press for the printing of a form releasably coveredwith an elastic foil, a type bed mounted in said press, a printing formmounted on said type bed, printing characters mounted on said form, achase mounted on said type bed and around said printing form, means forlocking said printing form in said chase, said means being positionedbetween the form and the chase. an elastic foil covering both saidprinting form having the printing characters thereon and said chase,positive pressure means for sealing the chase against the type bed, saidmeans being operatively connected to said chase, and negative pressuremeans for the air-tight sealing of said elastic foil against said chaseand said printing form, said means being operatively connected to saidtype bed and said chase and including a suction pipe passing throughsaid chase.

9. The apparatus of cla-im 8 including a sheet feeding and deliverymeans for said printing press and a suction pump connected to saidsuction pipe, for said sheet feeding and delivery means.

References Cited in the ille of this patent UNITED STATES PATENTS NumberName Date 654,421 Slotmann July 24, 1900 2,060,082 Johnson et al Nov.10, 1936 2,093,485 Schneider Sept. 21, 1937 2,174,726 Koppe Oct. 3, 19392,301,963 Marple et al Nov. 17, 1942

